ChronosMM: Routine at 54203

54203: Check Enemy-Bullet collision

Used by the routine at CHECK_ENEMY_COLLISIONS. IX points at address of 4 byte enemy data block
CHECK_ENEMY_BULLET_COLLISION	54203	LD IY,60093	Point IY at PLAYER_SHOTS
	54207	LD B,16	Prepare to loop 16 times to check each bullet
	54209	LD DE,3
	54212	LD H,(IX+0)
	54215	LD L,(IX+1)
CHECK_ENEMY_BULLET_COLLISION_0	54218	LD A,(IY+2)	Load A with current bullet's status code
	54221	CP 255
	54223	JP Z,CHECK_ENEMY_BULLET_COLLISION_2	Jump to 54289 to continue the loop if bullet is disabled
	54226	LD A,(IY+0)
	54229	CP H
	54230	JP C,CHECK_ENEMY_BULLET_COLLISION_2
	54233	SUB 4
	54235	BIT 7,A
	54237	JP NZ,CHECK_ENEMY_BULLET_COLLISION_1
	54240	CP H
	54241	JP NC,CHECK_ENEMY_BULLET_COLLISION_2
CHECK_ENEMY_BULLET_COLLISION_1	54244	LD A,(IY+1)
	54247	ADD A,3
	54249	CP L
	54250	JP C,CHECK_ENEMY_BULLET_COLLISION_2
	54253	SUB 6
	54255	CP L
	54256	JP NC,CHECK_ENEMY_BULLET_COLLISION_2
	54259	LD (IY+2),255	Disable bullet
	54263	LD (IX+2),255	Disable enemy
	54267	LD D,(IX+0)
	54270	LD E,(IX+1)
	54273	SRL D
	54275	SRL E
	54277	PUSH IX
	54279	CALL L56342
	54282	CALL L56117
	54285	POP IX
	54287	POP DE
	54288	RET
CHECK_ENEMY_BULLET_COLLISION_2	54289	ADD IY,DE
	54291	DJNZ CHECK_ENEMY_BULLET_COLLISION_0	Loop 16 times, once for each bullet
	54293	RET